Burglar-alarm apparatus.



No. 642,M7. Patented Jan. 30, I900. S. L. MORSE.

BURGLAB ALARM APPARATUS.

(Application filed Nov. 6, 1899.)

(No Mudel.)

WI T

S'rarns arnn'r OFFICE.

SUMNER L. MORSE, OF ATIIOL, lvlASSAGHUSE'lTlS.

BURG LAR-ALARM APPARATUS.

SPECIFICATION formingpart of Letters Patent No. 642,147, dated January 30, 1900.

Application filed November 6,1899- Serial No. 735,890. (No model.)

To all, whom it may concern.-

Be it known that I, SUMNER L. Monsn, of Athol Centre, in the county of lVorcester and State of Massachusetts, have invented certain new and useful lm provements in Burv glar-r'llarm Apparatus, of which the following is a specification.

The object of this invention is to provide for house and store doors an alarm-bell appa- .ratus of the class adapted to be applied to the door and casing and to be set so as to sound an alarm when the door is opened by unauthorized persons.

My 1' mprovements consist in the devices and combinations of devices hereinafter described and claimed, reference being had to the drawings illustrating the same.

A peculiarity which characterizes my apparatus is that the alarm hammer which strikes the gong projects from a shaft having a slight longitudinal and a partial rotary movement in bearings formed between two castings which constitute the fixed base of the device, both of said movements being due to the action of a single spring when the opening of the door releases the parts engaged in setting the alarm. This release is effected by the impinging of the shaft end upon a tripping device adjustably mounted on the door, such contact moving the shaft longitudinally far enough to allow the setting-arm on the opposite end of the shaft to slip off from a shoulder of the base which had engaged it, whereupon the spring partially rotates the shaft and causes the radial hammer to strike the gong. A loop of the spring forms a stop to limit this rotation. The wall of the base block adjacent to said shoulder is inclined, and in setting the alarm the setting-arm is pressed by its spring against said inclined wall and is caused to engage said shoulder and remain engaged until again released by another longitudinal movement. One member of the base has a marginal recess to receive an edgewise protuberance on the other, and one member has hooked arms which rest down upon uprights of the other, leaving openings between them for the shaft-bearings.

Figure 1 is a perspective view of the device mounted on a door-casing, the gong being removed from its stem or standard and the alarm set. Fig. 2 is a top view, the gong being partly in section. Fig. 3 is a side elevation. Fig. t is a perspective view of the two parts of the base which engage each other and support the shaft.

A and B are two metallic castings composing the base of the device and secured upon the door-casing 0 adjacent to the upper edge of the door D. The shape of these castings is best shown in Fig. 4, where they are detached, while the other views show their relative arrangement when in use.

The part A is countersunk to receive the fastening-screws and is cast with the stem or post A to support the gong or bell E and with two hooked arms co to form part of the bearings for the movable shaft F as well as to hold down the part B without requiring separate fastenings therefor.

The part B is upturned at its ends and concaved for the shaft-bearing and is formed with shoulders b 13 on which the tips of the hooks a rest. It has also a marginal protuberance D which enters a corresponding recess in part A to prevent their displacement.

A coiled spring G surrounds the shaft F and is secured at one end to the stem of the hammer H, while its prolonged end bears on the base-plate A, the spring being under moderate tension sufficient to cause the hammer to strike the bell E. The end of the shaft is formed with the transverse setting-army, the edge of which bears friotionally against the inclined wall I) of the shoulder b and engages with the top of said shoulder when the shaft is turned far enough. This sets the alarm and somewhat increases the tension of the spring, which is also under compression longitudinally, tending to move the shaft lengthw1se.

The edge of the door D is furnished with an adjustable tripping-arm J, the end of which is doubly beveled. This arm projects from the door, so as to strike the rounded end of the shaft F when the door opens or shuts, and thus moves such shaft endwise to a limited extent against the resistance of the spring G. This movement suffices to disengage the setting-arm f from the shoulder b, and the consequent rotation of the shaft causes the hammer to sound the alarm. A 100p gof the spring-wire G strikes the edge of the basecasting B and forms an elastic stop to the movement of the hammer.

I claim as my invention 1. In an alarm-bell apparatus,the base having a stem upon which the gong is mounted and provided with suitable bearings, the shaft movable in said bearings and carrying the alarm-hammer, and a setting-arm engaging with said base, in combination with a spring adapted to give both a rotary and a longitudinal movement to said shaft when said arm is released, and with a tripping device adapted to disengage said arm.

2. In an alarm-bell apparatus,the base made in two parts with raised bearings between them formed by semicircular recesses in engaging end standards of said parts, in combination with a shaft mounted in said bearings and carrying a radial hammer and setting-arm, a spring coiled around said shaft and arranged to partially rotate it, and with a tripping device serving to release the setting-arm when the door is opened.

3. In an alarm-bell apparatus,the base made in two parts with terminal standards having circular openings between them forming bearings for the hammer-shaft, said base parts engaging marginally and at the hearings to prevent their independent movement, in combination with a shaft mounted in said bearings and carrying the alarm-hammer, and with a coiled spring thereon actuating said shaft and hammer, and formed with an extension engaging the base, to hold the hammer when released at proper distance from the gong.

In testimony whereof I have affixed my signature in presence of two Witnesses.

SUMNER L. MORSE.

Witnesses:

D. H. ROGAN, FRANK F. MORSE. 

